I was thinking of replacing, a little at a time, my crushed coral substrate, which I have been told from many sources harbors nitrates like a homeless shelter, with RO rinsed, silicate free playsand. If I did this, would I need to add a ph buffer to keep my ph up, or would the live rock be calcerous enough to keep it up? My lr is mostly haitian lettuce rock.

I don't know if I'd get playsand...I saw someone else on this forum that had his tank crash. He had used playsand and had been kinda moving stuff around and stirred it up. The sand could have irritated the fish and might have been the cause of death. Playsand is very fine...I would worry about the potential to irritate a fishes gills

I don't know if I'd get playsand...I saw someone else on this forum that had his tank crash. He had used playsand and had been kinda moving stuff around and stirred it up. The sand could have irritated the fish and might have been the cause of death. Playsand is very fine...I would worry about the potential to irritate a fishes gills

Yeah, I noticed that as I put it in, so I made it a dsb and added a layer of not as fine live sand.